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Статті в журналах з теми "Oxynitriding"

1

Lakhtin, Yu M. "Oxynitriding (nitrooxidizing)." Metal Science and Heat Treatment 36, no. 9 (September 1994): 445–51. http://dx.doi.org/10.1007/bf01395901.

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2

Yaskiv, Oleh, Iryna Pohrelyuk, Waheed Ali Abro, Muhammad Ali Abro, Kun Sang Lee, and Dong Bok Lee. "Thermochemical Nitriding and Oxynitriding of Ti Alloys." Journal of Nanoscience and Nanotechnology 19, no. 7 (July 1, 2019): 4090–96. http://dx.doi.org/10.1166/jnn.2019.16267.

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3

Kamiński, Janusz, Justyna Witkowska, and Tadeusz Wierzchoń. "Corrosion Resistance of NiTi Shape Memory Alloy after Nitriding and Oxynitriding Processes under Glow Discharge Conditions for Medical Applications." Key Engineering Materials 687 (April 2016): 92–97. http://dx.doi.org/10.4028/www.scientific.net/kem.687.92.

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Анотація:
NiTi alloy is being increasingly used in medicine due to its unique properties, i.e. shape memory and superelasticity. As a self-passivating material it is characterized by relatively high biocompatibility, however its use for long-term medical implants is questionable due to the nickel content of ≥ 50%. Therefore, the investigations on the surface modification of NiTi alloy are carried out to improve its corrosion resistance and thus reduce the metalosis effect, i.e. the migration of the alloy constituents, especially nickel, into the surrounding tissue.In this paper, the surface topography and corrosion resistance of NiTi alloy (50,8%Ni) both before and after low-temperature nitriding and oxynitriding processes under glow discharge conditions, are presented.The study of surface topography showed a slight increase in roughness parameters after nitriding process and a significant increase in these parameters after the oxynitriding process. A similar trend was observed in the study of corrosion resistance. Both processes increase the corrosion resistance of NiTi alloy, as shown by both the impedance spectroscopy results, the values of corrosion potential (-65 mV for the alloy in the initial state, - 45 mV for the alloy with the nitrided layer, + 18 mV for the alloy with the oxynitrided layer) and the values corrosion current (respectively 0.047 μA/cm2, 0.043 μA/cm2, 0.015 μA/cm2).These comparative studies present an improvement of corrosion resistance of NiTi after the processes under glow discharge. The best results were obtained for the oxynitrided layer.
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4

Petrova, L. G., L. P. Shestopalova, and V. A. Aleksandrov. "Surface Hardening of Chromium Steel by Controlled Successive Oxynitriding." Metal Science and Heat Treatment 55, no. 11-12 (March 2014): 592–98. http://dx.doi.org/10.1007/s11041-014-9674-4.

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5

Sobiecki, Jerzy Robert, and Tadeusz Wierzchoń. "Glow discharge assisted oxynitriding of the binary Ti6Al2Cr2Mo titanium alloy." Vacuum 79, no. 3-4 (August 2005): 203–8. http://dx.doi.org/10.1016/j.vacuum.2005.03.008.

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6

Pohrelyuk, I. M., J. Padgurskas, O. V. Tkachuk, A. G. Luk’yanenko, V. S. Trush, and S. M. Lavrys. "Influence of Oxynitriding on Antifriction Properties of BT6 Titanium Alloy." Trenie i Iznos 41, no. 4 (August 2020): 457–63. http://dx.doi.org/10.32864/0202-4977-2020-41-4-457-463.

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7

Pohrelyuk, I. M., O. V. Tkachuk, R. V. Proskurnyak, N. M. Boiko, O. Yu Kluchivska, R. S. Stoika, and P. Ozga. "Cytocompatibility Evaluation of Ti-6Al-4V Alloy After Gas Oxynitriding." Journal of Materials Engineering and Performance 29, no. 12 (November 5, 2020): 7785–92. http://dx.doi.org/10.1007/s11665-020-05265-z.

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8

Wierzchoń, Tadeusz, Elżbieta Czarnowska, Justyna Grzonka, Agnieszka Sowińska, Michał Tarnowski, Janusz Kamiński, Krzysztof Kulikowski, Tomasz Borowski, and Krzysztof J. Kurzydłowski. "Glow discharge assisted oxynitriding process of titanium for medical application." Applied Surface Science 334 (April 2015): 74–79. http://dx.doi.org/10.1016/j.apsusc.2014.08.071.

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9

Liu, Han, Jingcai Li, Yating Chai, Wei Wei, and Jing Hu. "Kinetics and enhancement mechanism of plasma oxynitriding for AISI 1045 steel." Surface and Coatings Technology 302 (September 2016): 22–26. http://dx.doi.org/10.1016/j.surfcoat.2016.05.021.

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10

Pohrelyuk, I., J. Morgiel, O. Tkachuk, and K. Szymkiewicz. "Effect of temperature on gas oxynitriding of Ti-6Al-4V alloy." Surface and Coatings Technology 360 (February 2019): 103–9. http://dx.doi.org/10.1016/j.surfcoat.2019.01.015.

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Дисертації з теми "Oxynitriding"

1

Bartels, Rüdiger. "Metall-Isolator-Halbleiter-Tunnelkontakte mit Oxiden und Oxynitriden als Tunnelisolator." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960697683.

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2

Lai, Meng-tse, and 賴孟澤. "Effects of the Properties on SKD11 Tool Steel by Oxynitriding Processes." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/f2bmj7.

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Анотація:
碩士
國立臺北科技大學
材料及資源工程系研究所
98
In this study, JIS SKD11 tool steel is used and divided into three parameters of oxynitriding treatment. The first step is to change the temperature of oxynitriding treatment (470°C-8 h, 480°C-8 h, 490°C-8 h and 510°C-8 h) and keep the same post-oxidation time (30 min), then to find the optimal temperature of nitriding. The second step is change the soaking time of oxynitriding treatment (480°C-6 h, 480°C-8 h and 480°C-10 h) and soaking time of post-oxidation is same. Finally, we use the different soaking time of post-oxidation (480°C-8 h-30 min, 480°C-8 h-60 min, and 480°C-8 h-90 min) to evaluate and compare the effects of mechanical properties and microstructure on JIS SKD11 steel by different parameters of oxynitriding treatment. The experimental result showed that the hardness was increased by oxynitriding treatment after wear test. By the XRD analysis, it showed the ε phase (Fe3N) compounds were appeared on the steel surface which increased the wear resistance of material. Beside, increased the temperature of oxynitriding (470°C → 480°C → 490°C → 510°C) and kept the same soaking time of oxynitriding and post-oxidation treatment. It can be found as the temperature is increasing, the thickness of nitriding layer is higher and hardness is lower for JIS SKD11 by oxynitriding treatment. This result show that the substrate begging to soften after longer time and higher temperature reaction. In addition, by the different oxynitriding time (480°C-6 h, 480°C-8 h and 480°C-10 h) and post-oxidation of 30 min, the optimal wear-resistance was appeared in 8 hours after west test. Increasing the soaking time of post-oxidation (480°C-8 h-30min → 480°C-8 h-60min → 480°C-8 h-90min), it will affect the depth of nitriding layer. In this study, the nitriding layer was from 40 μm decreased to 10 μm that result in the lower hardness and poor wear-resistance. All these experimental results show that the optimal parameters of oxynitriding is 480°C-8 h-30 min for JIS SKD11 tool steel.
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3

Tang, Te-Chien, and 唐德謙. "Study on the DLC Films of Oxynitriding-treated ASP23 High Speed Steel by DC-pulsed PECVD Process." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/zpg98x.

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Анотація:
碩士
國立臺北科技大學
材料及資源工程系研究所
101
A surface treatment is usually used to improve tool life. The diamond-like carbon (DLC) film has many superior properties, such as high mechanical hardness, high wear resistance, a low friction coefficient and chemical inertness. The oxynitriding process uses air or steam at the end of the nitriding stage; used as an oxidizing medium, it is an integral part of the treatment. During the oxidation process, most steels can form several kinds of oxides (Fe2O3 and Fe3O4). Generally, the Fe3O4 layer of oxidation treatment can effectively protect and improve the erosion and corrosion resistance of steels. In addition, ASP23 is a cold work tool steel powder smelting, which provides a very high wear resistance and excellent toughness. There have been many previous experimental results that suggest that the plasma CVD using a DC-pulsed discharge could be effective in improving the adhesion and properties of coating films. Therefore, the oxynitriding/DLC duplex treatment is utilized for treated ASP23 High Speed steel in an attempt to increase the tool life. In this study, diamond-like carbon films were prepared by DC-pulsed PECVD after oxynitriding-treatment of ASP23 high speed steel. In order to investigate the DLC film properties, the Raman spectroscopy analysis, wear test, adhesion and hardness tests were performed. The chief study of the parameters of a DC-pulsed PECVD process included the coating time (60 min, 90 min and 120 min) and duty cycles (5%, 10%, 15% and 20%). The experimental results showed that a 0.06 mm oxynitride layer and 1-2 μm of DLC film could be obtained after the ASP23 high speed steel was treated by an oxynitride/DLC duplex treatment. The duplex coating layers had optimal properties when treated with a low pulse voltage (-2 kV), a coating time of 90 minutes and duty cycles kept at 10%. Meanwhile, the oxynitride/DLC duplex treatment possessed the highest surface hardness (Hv0.01 1931), and the lowest volume loss (3.46 × 10-3 mm3) after wear tests (load was 400 g). In addition, when comparing non-treated (Rp = 5442.6 Ω‧cm2) and oxynitriding (Rp = 7719.0 Ω‧cm2) specimens, the oxynitride/DLC duplex coating had the highest polarization resistance (Rp) of 11445.0 Ω‧cm2 in 3.5 wt% NaCl solution. These results were significant in indicating that the oxynitride/DLC duplex treatment possessed optimal corrosion resistance.
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4

Peng, Chang-Kai, and 彭昶凱. "Study on the DLC Films of Oxynitriding-treated PM30 High Speed Steel by the Asymmetric Bipolar-pulsed PECVD Process." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/76hqte.

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Анотація:
碩士
國立臺北科技大學
材料科學與工程研究所
105
PM30 is a cobalt alloy high performance PM high speed steel. The cobalt addition of approximate 8.5% has a positive influence on the strength, hardness, temper resistance and modulus of elasticity. As cobalt does not form carbides, the presence of cobalt has little influence on wear resistance. In order to improve the tool life and wear resistance, this research used duplex surface treatment to increase the tool life of PM30 high speed steel. Furthermore, the oxynitriding treatment can form several kinds of nitrides (Fe2N, Fe3N and Fe4N) and oxides (Fe2O3 and Fe3O4). A complex oxide layer, with Fe2O3 and Fe3O4 structures, is formed on the surface, improving the corrosion and erosion properties of the steel. Moreover, the oxynitriding layer not only improves wear resistance but also the adhesive strength as an intermediate layer. On the other hand, the amorphous hydrogenated carbon (a-C:H) coatings have attracted a great deal of attention because of their low friction, high hardness, high elastic modulus, chemical inertness, biocompatibility, and high degree of resistance to wear. In particular, the adhesion and other properties of DLC film can be effectively improved by an asymmetric bipolar-pulsed plasma CVD process; therefore, the oxynitriding/DLC duplex treatment is utilized for treating PM30 high speed steel in an attempt to increase tool life. In this study, DLC films were prepared by DC-pulsed PECVD after oxynitriding treatment of PM30 high speed steel. The experimental parameters included various CH4 gas flows (3, 7, 11, 15 and 19) and H2 gas flows (0.5, 1.0 and 1.5) with asymmetric bipolar-pulsed voltage (-15+10%). In order to compare the properties of the DLC films for oxynitriding/DLC-treated PM30 high speed steel, Raman spectroscopy analysis, wear tests, scratch tests, hardness tests, Rockwell indentation, nano-indentation and corrosion resistance inspections were performed. The experimental results show that 28 μm of oxynitriding layer could be successfully obtained after PM30 High Speed Steel was treated by the oxynitriding/DLC duplex treatment. As the CH4 gas flow increased to 19 sccm, the thermal energy which each ion gained was insufficient; this obviously resulted in poor adhesion and properties. Consequently, the duplex coating layers had optimal properties when DLC films were treated by asymmetric bipolar-pulsed voltage and with an appropriate volt (150 V). Meanwhile, the deposition time was 90 min, and the CH4 gas flow was maintained at 15 sccm, respectively. As a result, it possessed the lowest wear volume loss (when the load of 1.96 N and 4.9 N was 3.82 × 10-3 mm3 and 5.49 × 10-3 mm3, respectively). In this work, it was shown that more sp3 bond content in DLC film will improve its corrosion resistance. Indeed, when the CH4 gas flow increased to 15 sccm, it had the lowest corrosion current (Icorr = 1.43 × 10-4 A·cm-2) and highest polarization resistance (Rp = 531.94 Ω·cm2) in 3.5 wt% NaCl solutions. The study results also confirm that the optimal wear and corrosion resistance of PM30 high speed steel can be effectively improved through the asymmetric bipolar-pulsed PECVD-treated oxynitriding/DLC duplex treatment.
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5

Lin, Yu-Kai, and 林郁凱. "Study on the Thermal Erosion, Corrosion and Wear Behaviors of AISI H13 Tool Steel after Oxynitriding/TiAlN Duplex Surface Treatments." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/qb5493.

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Анотація:
碩士
國立臺北科技大學
材料科學與工程研究所
99
AISI H13 tool steels are almost exclusively used on extrusion and die-casting dies. They are characterized by high strength, ductility, good tempering resistance, and moderate cost. Thermal fatigue and erosion are the most important factors limiting tool life and resulting in the tool failure of hot work tool steels. A surface treatment is usually used to increase wear resistance as well as to improve corrosion resistance. The oxynitriding process uses air or steam at the end of the nitriding stage; used as an oxidizing medium, it is an integral part of the treatment. In addition, the TiAlN coating has high strength and thermally stable properties resulting from the cathodic arc PVD treatment; therefore, the oxynitriding/TiAlN duplex is used to treat AISI H13 tool steel in an attempt to increase tool life. In this study, the specimens were subjected to various surface treatments including oxynitriding, TiAlN coating, and oxynitriding/TiAlN duplex treatments. In order to investigate the molten loss for melting A390 aluminum alloy, wear resistance and corrosion resistance for different surface treatments were examined. XRD, SEM and OM microstructural inspections, erosion, wear and corrosion tests were performed. The experimental results indicated that a 0.03-0.04 mm oxynitride layer and a 3-4μm TiAlN thin film could be obtained after the oxynitride/TiAlN complex treatment. This duplex treatment had the highest surface hardness (Hv0.01 3463); thus, the wear behavior results showed both higher hardness and a lower wear volume (0.05 mm3). Moreover, the higher hardness and high thermally stable properties of the oxynitride/TiAlN duplex layer were found to have the most effective erosion resistance. The corrosion test results also showed the duplex layer to have the optimum corrosion currents of 9.64 × 10-5 and 4.42 × 10-6 A in 0.15 M HCl and 3.5 wt% NaCl solutions, respectively, signifying that the complex treatment resulted in the best corrosion resistance.
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6

Lee, Chun-I., and 李俊毅. "Study on the DC-Pulsed Plasma Chemical Vapor Deposition Coating DLC Films of the Oxynitriding-treated AISI H13 Tool Steel." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/8mujr2.

Повний текст джерела
Анотація:
碩士
國立臺北科技大學
材料及資源工程系研究所
100
A surface treatment is usually used to improve tool life. DLC has many superior properties, such as high mechanical hardness, high wear resistance, a low friction coefficient and chemical inertness. The oxynitriding process uses air or steam at the end of the nitriding stage as an oxidizing medium, which is an integral part of the treatment. During the oxidation process, most steels can form several kinds of oxides (Fe2O3 and Fe3O4). Generally, the Fe3O4 layer of the oxidation treatment can effectively protect and improve the erosion and corrosion resistance of steels. Therefore, the oxynitriding/DLC duplex treatment was utilized for treating AISI H13 tool steel in an attempt to increase tool life. In this study, the diamond-like carbon films were prepared by DC-pulsed plasma CVD after the oxynitride treatment of AISI H13 tool steel. In order to investigate the DLC films properties, Raman spectroscopy analysis, wear test, adhesion and hardness tests were performed. The study of the parameters of DC-pulsed plasma CVD process included the pulsed voltage, pre-treatment of argon gas and the substrate temperature. The experimental results showed that a 0.05-0.06 mm oxynitride layer and 1-2 μm of DLC thin film could be obtained after the oxynitride/DLC duplex treatment. The duplex coating layers had the optimal properties when treated by a low pulse voltage (-1.5 kV), pre-treatment of argon gas for 15 min and the substrate kept at a 50°C condition. Meanwhile, the oxynitride/DLC duplex treatments possessed the highest surface hardness (Hv0.01 1457), lowest wear volume (2.25 × 10-3 mm3) and lower friction coefficient (0.06).
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7

Lai, Yu-Cheng, and 賴育呈. "Investigation of the Characteristics of DLC Films on Oxynitriding-Treated Vanadis 8 Tool Steel via DC-pulsed Plasma CVD Technique." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hw8q7a.

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Анотація:
碩士
國立臺北科技大學
材料科學與工程研究所
106
Vanadis 8 tool steel is a chromium-molybdenum-vanadium alloy steel usually used for cold forging, powder pressing, extruder screw, and so on. MC-type carbides are precipitated in the matrix, making Vanadis 8 harder than other steels. In order to extend the tool life and wear resistance, this research utilized a duplex surface treatment on Vanadis 8 tool steel. Generally speaking, oxynitriding (ONC) treatment consists of oxide layer and nitride layer. Among them, oxide layer with Fe2O3 and Fe3O4 structure that forms dense passive film improves the corrosion properties, while nitride layer can enhance the surface hardness. Actually, the oxynitriding layer improves not only the corrosion properties, but also the adhesive strength as an interlayer. On the other hand, diamond-like carbon (DLC) has attracted wide attention owing to its unique properties, such as low friction, chemical inertness and good wear resistance. Furthermore, since the DC-pulsed plasma CVD technique can effectively improve the properties of DLC, our research utilized the ONC/DLC duplex treatment on Vanadis 8 tool steel, in order to investigate the characteristics of DLC films, as well as to increase tool life. In this paper, DLC films were deposited via DC-pulsed plasma CVD technique, by changing the gas flow of CH4 (5, 10, 15, 20 scccm) and Ar (1, 1.5, 2, 2.5 sccm), respectively. In order to compare the properties of the DLC films for ONC/DLC treated Vanadis 8 tool steel, Raman analysis, wear tests, Rockwell indentation, nano-indentation, corrosion tests, FT-IR, water contact angle analysis and surface morphology were used to analyze the properties of DLC coatings. The experimental results showed that the oxynitriding layer was about 68 μm. In addition, DLC film could be successfully deposited on oxynitriding-treated Vanadis 8 tool steel. Since the amount of ion bombardment can cause differences in film properties, the duplex coating layers consequently had optimal properties when DLC films was treated by bipolar-pulsed voltage and with an appropriate volt (150 V). Meanwhile, the deposition time was 90 min, the gas flow of CH4 was maintained at 15 sccm, and the gas flow of Ar was at 1.5 sccm, respectively. The wear tests showed the lowest wear volume loss when the load of 2 N and 5 N was 3.81 × 10-3 mm3 and 4.01 × 10-3 mm3, respectively. Moreover, the corrosion tests also possessed the lowest corrosion current (Icorr = 4.56 × 10-5 A·cm-2) and highest polarization resistance (Rp = 1414.12 Ω·cm2) in the 3.5 wt% NaCl solutions. As the SEM surface morphology indicated, the thickness of DLC film was about 2.5 μm. According to the nano-indentation tests, the hardness of DLC film was 17.78 GPa and the elastic modulus was 191.63 GPa, respectively. Water contact angle was 78.11°, thus the DLC films could make Vanadis 8 tool steel more hydrophobic. The above analysis and test results confirmed that the duplex surface treatment can effectively improve the properties of Vanadis 8 tool steel and extend the tool life.
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8

Yu, Chun-Cheng, and 余鈞正. "Study on the DLC Films of Oxynitriding-treated JIS SKD11 Tool Steel via Various Duty Cycles of DC-pulsed PECVD Process." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/x2gv94.

Повний текст джерела
Анотація:
碩士
國立臺北科技大學
材料科學與工程研究所
102
JIS SKD11 tool steel is a commonly used cold work tool steel. Due to its high wear resistance and appropriate toughness, SKD11 is often using for stamping molds, plastic molds and other multi-function items. To improve tool life, many studies have focused on surface treatment as a method of protecting the internal material. The oxynitriding process can form several kinds of nitride (Fe2N、Fe3N and Fe4N) and oxides (Fe2O3 and Fe3O4). Generally, the Fe3O4 layer of oxidation treatment can effectively protect and improve the erosion and corrosion resistance of steels. Diamond-like carbon (DLC) films have many superior properties, such as high mechanical hardness, high wear resistance, a low friction coefficient and chemical inertness. In addition, the adhesion and properties of DLC film can be effectively improved by a DC-pulsed discharge of the plasma CVD process. Therefore, the oxynitriding/DLC duplex treatment is utilized for treated SKD11 tool steel in an attempt to increase tool life. In this study, diamond-like carbon films were prepared by DC-pulsed PECVD after oxynitriding-treatment of SKD11 tool steel. The chief study of the parameters of a DC-pulsed PECVD process included the duty cycles with unipolar negative-pulsed voltage and unbalanced bipolar-pulsed voltage. In order to evaluate the properties of the DLC films for oxynitriding/DLC-treated SKD11 tool steel, Raman spectroscopy analysis, wear tests, scratch tests, hardness tests and corrosion resistance inspections were performed. The experimental results showed that a 46 μm oxynitride layer and 1-2 μm of DLC thin film could be successfully obtained after the JIS SKD11 tool steel was treated by the oxynitriding/DLC duplex treatment. All the DLC films of the oxynitride/DLC duplex treatment possessed good adhesion and excellent characteristics. Particularly, the duplex coating layers had optimal properties when DLC films were treated by an unbalanced bipolar pulse voltage, with a low pulse voltage (-1.5 kV), a coating time of 90 min and duty cycles maintained at -15+10%. Meanwhile, the oxynitride/DLC duplex treatment possessed the highest surface hardness (Hv0.025 2830.7) and lowest wear volume loss (when the sliding speed of 0.05 m‧s-1 and load of 200 g was 4.07 × 10-3 mm3; sliding speed 0.25 m‧s-1 and load 200 g, was 4.01 × 10-3 mm3; sliding speed 0.25 m‧s-1 and load 500 g, was 5.83 × 10-3 mm3, respectively). In addition, the optimal oxynitriding/DLC duplex coating possessed the lowest corrosion current (Icorr = 2.66 × 10-6 A‧cm-2) and highest polarization resistance (Rp = 1.57 × 104 Ω‧cm2) in 3.5 wt% NaCl solutions. These results confirmed that the optimal wear and corrosion resistance followed the oxynitriding/DLC duplex treatment.
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9

CHIU, HAN-SHENG, and 邱瀚生. "Study on the Deposited CrN and CrC Films on Oxynitriding-treated PM30 High Speed Steels by the Unbalanced Magnetron Sputtering Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/v2ajx9.

Повний текст джерела
Анотація:
碩士
國立臺北科技大學
材料科學與工程研究所
107
PM30 high speed steel is a high-performance PM high speed steel made of a cobalt alloy. The addition of approximately 8.5% cobalt has a positive improvement on the hardness, strength, modulus of elasticity, and temper resistance. PM30 high speed steel can form many kinds of nitrides and oxides on the surface by oxynitriding (ONC) treatment. Generally speaking, nitrides are usually in the form of Fe3N and Fe4N. After oxynitriding treatment, a complex oxide layer with Fe2O3 and Fe3O4 structures is formed on the surface, thereby effectively improving the corrosion and wear resistance properties of the steel. Moreover, the oxynitriding layer not only improves the mechanical properties but also the adhesive strength as an intermediate layer. CrN and CrC films have many excellent properties, such as a low friction coefficient, high hardness, and high wear resistance and corrosion resistance. The adhesion and properties of CrN and CrC films can be obviously improved by an unbalanced magnetron sputtering process. Therefore, ONC/CrN and ONC/CrC duplex surface treatments are used for treated PM30 high speed steel in in an attempt to increase tool life. In this experiment, CrN and CrC films were deposited by unbalanced magnetron sputtering after the oxynitriding-treatment of PM30 high speed steel. Among them, the reaction gas of the CrN coating was N2. The gas flow rate was 17.5 sccm, while the reaction gas of the CrC coating was CH4 and C2H2. The gas flow rate was 3 and 6 sccm, respectively, and the coating time was maintained at 180 minutes. In order to evaluate the microstructure and properties of the CrN and CrC, hardness tests, wear tests, corrosion resistance inspections, and adhesion tests were performed. XRD, SEM, EDS and OM instruments were used to analyze the microstructure. The experimental results showed that an oxynitride layer with a thickness of about 26 μm was obtained after the PM30 high speed steel received oxynitriding treatment. The experimental results also revealed that the optimal procedure was the ONC/CrC duplex surface treatment. Meanwhile, the highest surface hardness increased to about 2852.2 HV0.1, and the adhesion was about HF3~4 level. Moreover, it possessed the lowest wear volume loss (for a sliding speed of 0.1 m•s-1 and a load of 10 N, it was 5.54 × 10-3 mm3). In addition, the optimal ONC/CrC duplex treatments also obtained the lowest corrosion current (Icorr = 5.32× 10-6 A•cm-2) and the highest polarization resistance (Rp = 1.02 × 104 Ω•cm2) in 3.5 wt% NaCl solutions. These results confirmed that the optimal corrosion resistance and wear followed the ONC/CrC duplex surface treatments.
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10

WEN, YU-CHENG, and 溫昱丞. "Investigation of the Properties of DLC Films on Oxynitriding-treated Vanadis 10 Tool Steel by DC-pulsed Plasma Enhanced CVD Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/85vy3f.

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碩士
國立臺北科技大學
材料科學與工程研究所
107
Vanadis 10 tool steel is a high vanadium alloy steel which is manufactured by powder metallurgy. The tool steel possesses great strength, hardness, and wear resistance after appropriate heat treatment, and it is generally used for various molds, cutting tools, or extruder screws. In general, oxynitriding (ONC) treatment consists of nitride (Fe3N) and oxide (Fe3O4) layers. Among them, the oxynitriding layer can improve not only the hardness but also the adhesive strength as an interlayer. Furthermore, DLC (diamond-like carbon) films have been widely applied due to their unique properties such as high strength, chemical inertness, extremely high wear resistance, and corrosion resistance. Therefore, in order to extend tool performance and life, this study employed duplex surface treatment (ONC/DLC) technique on Vanadis 10 tool steel. In this study, DLC films were coated on the oxynitriding-treated Vanadis 10 tool steel using the DC-pulsed plasma CVD technique. The different experimental parameters included the pulsed voltage (-2, -3, -4 and -5 kV) and duty cycles (9, 13, 17 and 21%). In addition, the properties of DLC films were measured by Raman spectroscopy, Rockwell indentation, wear tests, corrosion tests, water contact angle tests, four-point probes, Fourier-transform infrared spectroscopy, and surface morphology analysis, respectively. The experimental results showed that after oxynitriding treatment, the Vanadis 10 tool steel could form an oxynitriding layer with a thickness of about 68 μm. Meanwhile, the surface hardness increased to about 1293 HV0.05. Moreover, the duplex coating layers consequently had optimal properties when the DLC films were treated with an asymmetric bipolar-pulsed voltage that had the appropriate pulse frequency (10 kHz) and pulse voltage (-3 kV). Meanwhile, the duty cycle was 17%, the deposition time was 90 min, the gas flow of CH4 was maintained at 15 sccm, and the gas flow of Ar was at 1.5 sccm, respectively. The results of the Raman spectroscopy indicated that the most of the sp3 bond content in the DLC films was due to the lowest ID/IG value. The wear tests showed the lowest wear volume loss when the load of 2 N and 5 N was 3.49 × 10-3 mm3 and 4.08 × 10-3 mm3, respectively. Moreover, the optimal DLC films also possessed the lowest corrosion current density (Icorr = 7.91 × 10-5 A·cm-2) and highest polarization resistance (Rp = 1185.21 Ω·cm2) in the 3.5 wt% NaCl solution during corrosion tests. The water contact angle tests showed that the DLC films had great hydrophobicity (78.33). The FT-IR spectrum analysis found that the two strongest absorption peaks were located at 2852 cm-1 and 2921 cm-1. Overall, the study results confirmed that the duplex surface treatment (ONC/DLC) could effectively improve the properties of Vanadis 10 tool steel and extend the tool life.
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Частини книг з теми "Oxynitriding"

1

"Nitriding in Fluidized Beds." In Practical Nitriding and Ferritic Nitrocarburizing, 111–18. ASM International, 2003. http://dx.doi.org/10.31399/asm.tb.pnfn.t65900111.

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Abstract A fluidized-bed furnace system can be used for the gas nitriding process. This chapter focuses on fluidized-bed nitriding. It discusses the methods of heating a fluidized bed. The heating system can be electrical or gas, and internal or external. The chapter describes nitriding and oxynitriding processes in the fluidized-bed furnace. It also explains how to operate the fluid bed for nitriding. The chapter provides a discussion on the measurement of the gas dissociation.
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2

"Ion Nitriding." In Practical Nitriding and Ferritic Nitrocarburizing, 71–88. ASM International, 2003. http://dx.doi.org/10.31399/asm.tb.pnfn.t65900071.

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Abstract This chapter begins with an overview of the history of ion nitriding. This is followed by sections that describe how the ion nitriding process works, glow discharge characteristics, process parameters requiring good control, and the applications of plasma processing. The chapter explores what happens in the ion nitriding process and provides information on its gas ratios. It describes the reactions that occur at the surface of the material being treated during iron nitriding and defines corner effect and nitride networking. Further, the chapter provides information on the stability of surface layers and processes involved in the degradation of surface finish and control of the compound zone formation. Gases primarily used for ion nitriding and the control parameters used in ion nitriding are also covered. The chapter also presents the philosophies and advantages of the plasma generation technique for nitriding. It concludes with processes involved in oxynitriding.
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Тези доповідей конференцій з теми "Oxynitriding"

1

Miao, Chunlin, John C. Lambropoulos, Henry Romanofsky, Shai N. Shafrir, and Stephen D. Jacobs. "Contributions of nanodiamond abrasives and deionized water in magnetorheological finishing of aluminum oxynitriden." In SPIE Optical Engineering + Applications, edited by James H. Burge, Oliver W. Fähnle, and Ray Williamson. SPIE, 2009. http://dx.doi.org/10.1117/12.826453.

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